explosive day, literally, in court yesterday. judge napolitano joins us live to tell us whether or not he's ever heard such language in any of his courts. that's up next here on "happening now." >> yes, i've heard such language. jon: he was one of the nation's most wanted fugitives. 83-year-old james "whitey" bulger, the alleged former leader of boston's irish mafia, also the winter hill gang. he was captured back in 2011 after nearly two decades on the run. he's now currently on trial for a long list of crimes including 19 killings. judge andrew napolitano, a fox news senior judicial analyst, is with us, and i guess there were some fireworks in court yesterday. a guy that he hadn't laid eyes on in something like 16 years, kevin weekes -- >> right. jon: a former enforcer or heavy for his gang is testifying in court, and, well, referred to bulger as a rat. that brought all kinds of fireworks. >> yeah. the government contends, and it's in the process of proving its case and, candidly, the evidence of guilt is overwhelming, but the government contends this man was an enforcer for mr. bulger.